Date of Award
Spring 1994
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Dentistry
First Advisor
Dhuru, Virendra B.
Second Advisor
Ferguson, Donald J.
Third Advisor
Gannon, Michael
Abstract
The prevalence of loose bands in orthodontic treatment continues to plague the specialty. They not only consume a considerable amount of chairside time in recementation, but may also slow treatment progress. If the failure is not detected, there is also a danger of enamel decalcification. Manufacturers, researchers, and clinicians are continuously developing new materials and techniques, as well as modifying existing ones, to improve retention of orthodontic bands. Microetching and the use of a resin-modified glass ionomer cement are currently gaining popularity in the orthodontic field. This experiment was designed to compare the retentive ability of three cements, a resin-modified glass ionomer, a conventional glass ionomer, and zinc phosphate cement, and evaluate the influence of microetching the orthodontic band material on the tensile bond strength of the cement using bovine teeth as a substrate. One hundred bovine incisors were assigned to five treatment groups. Orthodontic band material, microetched or unmicroetched, was cemented with one of the three cements. The specimens were stored in air at room temperature 24 hours prior to testing. A custom fabricated alignment apparatus and an lnstron testing machine were utilized to apply a tensile force. The force required to induce bond failure was recorded and the site of bond failure was evaluated by visual inspection. The following conclusions were obtained: 1. The order of retentiveness from most retentive to least retentive is as follows: Ketac-Cem with microetching, Band Lok with microetching, Band Lok without microetching, Ormco Gold without microetching, and Ketac-Cem without microetching. 2. No significant difference exists in the tensile bond failure loads of the three cements without microetching the orthodontic band material. 3. The tensile bond failure loads for Ketac-Cem used with microetching the orthodontic band material was significantly greater compared to the other four treatment groups. 4. A significant difference exists in the site of bond failures for the three cements. Band Lok predominantly exhibited tooth-cement interface failures, Ketac-Cem predominantly exhibited bandcement interface and mixed failures, and Ormco Gold predominantly showed band-cement interface failures.
Recommended Citation
Gutierrez Paras, Maria Teresa, "Orthodontic Band Retention Using Microetching and Resin-Modified Glass Ionomer and Conventional Glass Ionomer Cements" (1994). Master's Theses (1922-2009) Access restricted to Marquette Campus. 5194.
https://epublications.marquette.edu/theses/5194